A little old? Maybe, but I expect there are still some in service.
I have been running this device since before I knew about Open-WRT. As the expression goes, if it ain't broke, don't fix it. It's happily been running on a very old DD-WRT as an AP with USB and Guest LAN. Recently it's had some Wireless connection issues, and I'm not sure that upgrading to Open-WRT will fix that, but I thought I would try.
I first used the DD-WRT Reset to Factory option in the GUI. Not sure this was needed, but I did it anyhow. I needed to do a 30 second press of the reset button to find the router again.
I then used the wdr3600v1_webrevert.bin file from DD-WRT. While there are posts on this file not being available and it shows on the DD-WRT FTP page as 1KB, if you right-click and use the Save Link As (Windows) the file properly downloads. It can also be found by Googling on other sites. I ran this directly from the DD-WRT GUI. There is a post on DD-WRT suggests using putty or WinSCP, load it up to the tmp folder and upgrade by command line, but I did not need to do this.
It took close to 5 minutes to re-flash to the Stock TP-Link (never bothered to see what version) and reboots to 192.168.0.1 with admin\admin as credentials.
I then went into the TP-Link GUI, directly to the Upgrade Firmware page, and uploaded the latest Open-WRT 19.07.2 (openwrt-19.07.2-ar71xx-generic-tl-wdr3600-v1-squashfs-factory.bin). Unfortunately the file would not load with a message indicating to "select a file". I made a copy and renamed this to a more generic wdr3600.bin. This was accepted and loaded up fine.
I kept a CMD window open with ipconfig at the ready to monitor the IP changes after each flash.
Easy Peasy, about 20 minutes start to finish.
Performance: (with default settings)
- 5G Read\Write Internet testing max's my connection speed of 50\20 and 2.4G hit 17\18 using Speedtest.net.
- WLAN 5G Read\Write are 80\135 and WLAN 2.4G about 22\38.
- Lan speeds Read\Write are 735\700 which is consistant with the rest on my network.
- Wireless LAN card is an Intel N-7260
- I use Totusoft Lan Speed Test (lite) to measure LAN speeds on Windows.
I have also restored the Dumb AP and Dumb AP Guest functionality that I used to have.